Girder-form support.



C. M. MARKHAM.

GIRDBR FORM SUPPORT.

APPLICATION FILED MAY 20, 1912 Patented Feb. 16, 1915.

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Patented Feb. 16

C. M. MARKHAM.

GIRDER FORM SUPPORT.

APPLICATION E11-.ED -MAY 2o, 1912 titl emanan-roam surronr.

nieaoa.

pecication of Letters Patent.

Patented llfeb. lid, ltlll.

Application tiled May 20, 19153. Serial No. 698,450.

To all whom t may concern.'

Be it lrnown that I, CHARLES ll/l. MARKHAM, a citizen of the UnitedStates, residing at San Diego, in the county of San Diego and State ofCalifornia, have invented an Improved Girder-Form Support, of which thefollowing is a full and exact description.

This invention has reference to an organization of elements of animproved construction, which are capable of acting as a liftingmechanism and a supporting device for forms such as are used in concreteconstruction, especially the forms used for floors and girders and for lbeams, rods, planks, and the like,the said elements being so relatedthat the organization will be effective for the support of a form for aconcrete girder of any cross sectional dimensions, that a form for agirde'r with diverging sides disposed at any angle may be supported withequal facility, that the construction and arrangement of parts will besuch as to be vertically adjustable, obviating lthe necessity in jackingup the floor joists or form plates, of wedges and other additionaltimbers as are ordinarily employed."` to effect such purpose, that theform s pporting mechanism will be strong, simple' and durable, andtherefore of a low cost' to manufacture, that the organization shallcontain no delicate or finely adjusted elements which would be likely tobe alfected by contact with, or clogged by accumulations of the concreteas used in the said concrete construction, that eoncrete forms may bereadily and properly set up with accuracy' with the organization ofelements provided, that no wood need be employed in erecting mold formswith this apparatus, that the vertical adjustment provided willrenderdthe apparatus effective for'all ordinary concrete construction,that all the elements of the devi-ce are as easily .renewable as ispractical. and consistent with the strength required, that means areprovided for the quick release of the device from the completed Work orstructure to which the same has been applied, and that the device orapparatus embodied in the herein described organization of elements,shall be as simple in design as may be practical to accomplish theresults desireda The principles herein related may be embodied into anysuitable form of mechanism and combination parts provided that theelements thereof shall be so relatively proportioned and so arranged asto operate in the manner hereinafter described and perform the functionsherein enumerated, and therefore for the purpose of explanationA and torender the invention more intelligible, such invention may be embodiedto comprehend a lifting, clamping, and supporting mechanism in whichsome of the elements will be operative relatively to the others foradjusting and maintaining concrete molds and forms in their set uppositions, a preferred form of the invention, having the propercorrelative parts, being shown in the accompanying drawings forming apart of this specification.

While simple and efficient means are herein provided for accomplishingthe objects of the invention and the elements shown and described arewell adapted to serve thev purposes for which they are intended, it

is to be understood that no limitation is necessarily made to theprecise structural details exhibited, but that variations, altera tions,and modifications, which may fall within the scope of the appendedclaims, may be adopted if desired, the essence of the inventioncomprising a standard, a movable member slidably mounted therein, arocker carried by said standard, means for operating the rocker,gripping levers acting upon said movable member and actuated bysaidfreclnea, and. means for clamping and supporting concretewmolds,andforms, carried by said movablel member, the invention being fullyillustrated in the accompanying drawings, whereon* Figure l is aperspective vievvwafa lifting y jack and girder supportineorporating'the principles of this invention.

Fig. 2 is a side elevation with the gripping levers partly in section.Fig. 3 is a plan and detail view of the rocker showing the releaselevers. Fig. it is a side elevation of the device disclosing thereleasing levers and a portion of the bar which operates them. Fig. 5 isa transverse sectional and detail view of the rocker disclosing therelative positions of the gripping lever, the releasing lever tl:;ereforand the bar for operating the releasing-leven J@assuming the inventionto' be embodied in the form illustrated, the elements referred tocomprise a standard l, preferably constructed 'of steel or iron pipe,and'having a flange or base 2, the opposite endg-being provided with atable support 3, having a rib thereon. A relatively movable member 4:`is arranged in and concentric .with said standard and extends upwardtherefrom. A rocker 5 has a wide groove 'upon the bottom thereof, saidgroove engaging with rib 7 on table 3. Rocker 5 carries a fork 8 and afork 9, which are located respectively, on opposite ends of said rocker.Fork member 8, has a link member 10, pivotally connected thereto, andfork member 9, has a link member 11, pivotally connected thereto, linkmember 10, being a relatively short member and link member 11,being arelatively long member. The bifurcated upper ends of said link membershave pivoted thereto gripping levers 12 and 13, the openings 14 and 15,provided therein, extending obliquely therethrough. Loops 16, on theside of the rocker, are adapted to receive a handle or operating bar 17.To obtain an adjustment of the relatively movable membe4, the saidoperating bar 17 is inserted in loops 1G and given an oscillatingmotion. This motion is transmitted to the rocker and causes thealternate depression of the opposite ends thereof, whereupon said linkmembers 10 and 11 will release the respective gripping levers 12 and 13,attached thereto, which, upon their release, will drop down and againgrip the central and mov# able member 4, and lift the same on the upwardmotion of the corresponding end of the rocker. While one gripping leveris released for obtaining a new grip on member 4, the opposite grippinglever retains its hold on member 4.

In combination with member 4, l have provided a double Y member 28,carrying the essential parts of my girder support, comprising a centralpipe 19, extending upwardly theref1'Om;and a horizontally disposed pipe20, which is adapted to support a girder form or mold for the receptionof concrete material, the outer ends of said pipe 20, being furthersupported by brace members 21.

In order to support the side members of thel girder form or mold,elongate members or bars 22, preferably of channel iron, are provided,the said bars 22, being slidably l mounted in rectangular slots 23,obliquely disposed in clamp members 24, which are pivotally connected tohook members 25, which are adapted to engage with said horizontal bar orpipe member 20. Members 22, may be readily elevated to any position butwill be locked against any vertical movement in any position bybifureated members 26, and 27, which are pivotally' connected to loopmembers 18 and 29 respectively, the said members 26 and 27 be| ingadapted to bear against members 22, upon any downward movement thereof,the said members 22 being forced into engagement with the lateral edgesof said members 24, 26, and 27. By such construction the greater theweight of members 22, the more secure will be the clamping thereof. Tolower said members 22, it is only necessary to slightly raise the outerextremities of members 24, and to disengage members 27,

whereupon said members 22 will drop because of their own gravity.

Loop members 18 and 29 have an obliquely disposed opening therein, notshown in the drawing, also members 24 are provided with obliquelydisposed openings 23, and their action in gripping their support issimilar to gripping levers 12 and 13. Therefore, to support girders ofany width, the said members 18 and 29 may be moved horizontally upontheir supports. To insure a positive engagement of members 27' withmembers 22, I have provided said members 27 with transversely extendingridges 30, the same being received by correspondingly shaped recesses31, in members 22; each of the latter being provided with a series ofsuch recesses thereby effecting a rigid securement thereof andpermitting various adjustments to be made. Bars 32 which engage loopmembers 29, have their inner extremities looped around an eye 33,projecting from member 28, and are provided at their opposite ends withcotter pins 34, to prevent accidental disengagement of said members 29,therefrom. Similar pins 35 are provided in members 22. To support Ibeams and similar bars for carrying the Hoor beams and forms for thefloor, the upper ends of members 22, are provided with brackets 36,which form with said members 22 a fork Aer support, by which am enabledto support the forms and molds for combined doors and girders. 1t may benoted that central pipe or support 19, is provided with a half roundfitting 37 which acts as a pillow for horizontal bar 20, thereby leavingsaid bar 2O smooth for supporting the bottom plank of a mold or forni ofany width.

Should it be desirable to lower the girder support slightly while in theset up position, the rocker member 5 has pivoted thereto releasinglevers 38, having their inner extremities 39, extending upward andbeneath gripping levers 12 and 13, and their outer extremities 40,extending from one side of the rocker. A pair of elongated loops 41, areadapted to carry an operating lever 42, which normally rests lightlyupon releasing levers 38. By operating lever 42, the outer extremitiesof levers 38 will be alternately depressed, causing the innerextremities to engage with and thereby release gripping levers 12 and13, and thereby lower member 4, the downward movement of which may becontrolled by lever .17 on the opposite side of rocker 5.

, It is to be understood that various forms of girder supports maybeused, a modified form being shown in Fig. 2 having a bracket 43 attachedto member 4, and a modified form being shown in Fig. 4, having a Harigemember 44 carried by member-4. Rocker 5 is provided with an elongatedopening 45, through which member 4 passes.

The gripping tendency of the several clamping hooks, loops, and levers,is increased in proportion to the weight or pressure placed thereon. Allelements of the device may be of iron or steel, an especial advantage inconcrete construction, and may be adjusted laterally, angularly, andvertically, adapting the device for various sizes and shapes of girders.

l claim as my invention:

l. In a girder form support, the combination with a frame comprising avertical member, a double Y member carrying the vertical member, ahorizontal bar supported by said vertical member, braces eX- tendingfrom the outer ends of the horizontal bar to said double Y member, of aneyev horizontally disposed alining bars connected' to said eye, loopmembers slidably mounted on said first named horizontal bar and saidalining bars, bearing members connected to v said loop members, hookmembers slidably All mounted on said first named horizontal bar, grippinmembers on said horizontal member, an elongate channel irons supportedby said bearing members and said gripping members whereby said elongatechannel..

irons are held in their downward movement.

3. lin al girder form support, the combination with a frame comprising adouble Y member, a horizontal bar and three branches extending betweensaid horizontal bar and said double Y member, of an eye projecting fromsaid frame, horizontally disposed alining bars connected vto said eye,loop members slidably mounted on said horizontal bar, loop membersslidably mounted on said alining bars, slotted members pivoted to saidloop members, channel irons carried by said slotted members, and meanson said horizontal bar for guiding and supporting said channel irons. y

4. lln a girder form support, a frame comprising al double Y member, ahorizontal bar, a half round member supporting said horizontal bar,avertically extending brace supporting said half round member and eX-tending from saidv double Y member, angularly disposed braces supportingthe ends of said horizontal bar, an eye on said double Y member, aliningbars connected to said eye, loop members slidably mounted on saidhorizontal bar, loop members slidably mounted on said alining bars,slotted mem- ,bers pivoted to said loop members, hook members slidablymounted on said horizontali bar, gripping members pivotally mounted onsaid hook'members, elongate bars slidably mounted in the slots in saidslotted members and said gripping member, whereby they are normally heldfrom downward movement by the pressure upon the edges of. said slots andby said ipping memy bers, the saidy elongate bars aving a series ofrecesses and transverse ridges on some of said slotted members adaptedto engage in said recesses.

ln testimony whereof I have atlixed my signature to the foregoingspecification, this 11th day of May, in the year 1919..

CHARLES M. MARKHAM. ln the presence o

